1Kernel driver f71882fg
2======================
3 4Supported chips:
5 * Fintek F71808E
6 Prefix: 'f71808e'
7 Addresses scanned: none, address read from Super I/O config space
8 Datasheet: Not public
9 * Fintek F71808A
10 Prefix: 'f71808a'
11 Addresses scanned: none, address read from Super I/O config space
12 Datasheet: Not public
13 * Fintek F71858FG
14 Prefix: 'f71858fg'
15 Addresses scanned: none, address read from Super I/O config space
16 Datasheet: Available from the Fintek website
17 * Fintek F71862FG and F71863FG
18 Prefix: 'f71862fg'
19 Addresses scanned: none, address read from Super I/O config space
20 Datasheet: Available from the Fintek website
21 * Fintek F71869F and F71869E
22 Prefix: 'f71869'
23 Addresses scanned: none, address read from Super I/O config space
24 Datasheet: Available from the Fintek website
25 * Fintek F71869A
26 Prefix: 'f71869a'
27 Addresses scanned: none, address read from Super I/O config space
28 Datasheet: Not public
29 * Fintek F71882FG and F71883FG
30 Prefix: 'f71882fg'
31 Addresses scanned: none, address read from Super I/O config space
32 Datasheet: Available from the Fintek website
33 * Fintek F71889FG
34 Prefix: 'f71889fg'
35 Addresses scanned: none, address read from Super I/O config space
36 Datasheet: Available from the Fintek website
37 * Fintek F71889ED
38 Prefix: 'f71889ed'
39 Addresses scanned: none, address read from Super I/O config space
40 Datasheet: Should become available on the Fintek website soon
41 * Fintek F71889A
42 Prefix: 'f71889a'
43 Addresses scanned: none, address read from Super I/O config space
44 Datasheet: Should become available on the Fintek website soon
45 * Fintek F8000
46 Prefix: 'f8000'
47 Addresses scanned: none, address read from Super I/O config space
48 Datasheet: Not public
49 * Fintek F81801U
50 Prefix: 'f71889fg'
51 Addresses scanned: none, address read from Super I/O config space
52 Datasheet: Not public
53 Note: This is the 64-pin variant of the F71889FG, they have the
54 same device ID and are fully compatible as far as hardware
55 monitoring is concerned.
56 * Fintek F81865F
57 Prefix: 'f81865f'
58 Addresses scanned: none, address read from Super I/O config space
59 Datasheet: Available from the Fintek website
60 61Author: Hans de Goede <hdegoede@redhat.com>
62 63 64Description
65-----------
66 67Fintek F718xx/F8000 Super I/O chips include complete hardware monitoring
68capabilities. They can monitor up to 9 voltages, 4 fans and 3 temperature
69sensors.
70 71These chips also have fan controlling features, using either DC or PWM, in
72three different modes (one manual, two automatic).
73 74The driver assumes that no more than one chip is present, which seems
75reasonable.
76 77 78Monitoring
79----------
80 81The Voltage, Fan and Temperature Monitoring uses the standard sysfs
82interface as documented in sysfs-interface, without any exceptions.
83 84 85Fan Control
86-----------
87 88Both PWM (pulse-width modulation) and DC fan speed control methods are
89supported. The right one to use depends on external circuitry on the
90motherboard, so the driver assumes that the BIOS set the method
91properly.
92 93Note that the lowest numbered temperature zone trip point corresponds to
94to the border between the highest and one but highest temperature zones, and
95vica versa. So the temperature zone trip points 1-4 (or 1-2) go from high temp
96to low temp! This is how things are implemented in the IC, and the driver
97mimicks this.
98 99There are 2 modes to specify the speed of the fan, PWM duty cycle (or DC
100voltage) mode, where 0-100% duty cycle (0-100% of 12V) is specified. And RPM
101mode where the actual RPM of the fan (as measured) is controlled and the speed
102gets specified as 0-100% of the fan#_full_speed file.
103 104Since both modes work in a 0-100% (mapped to 0-255) scale, there isn't a
105whole lot of a difference when modifying fan control settings. The only
106important difference is that in RPM mode the 0-100% controls the fan speed
107between 0-100% of fan#_full_speed. It is assumed that if the BIOS programs
108RPM mode, it will also set fan#_full_speed properly, if it does not then
109fan control will not work properly, unless you set a sane fan#_full_speed
110value yourself.
111 112Switching between these modes requires re-initializing a whole bunch of
113registers, so the mode which the BIOS has set is kept. The mode is
114printed when loading the driver.
115 116Three different fan control modes are supported; the mode number is written
117to the pwm#_enable file. Note that not all modes are supported on all
118chips, and some modes may only be available in RPM / PWM mode.
119Writing an unsupported mode will result in an invalid parameter error.
120 121* 1: Manual mode
122 You ask for a specific PWM duty cycle / DC voltage or a specific % of
123 fan#_full_speed by writing to the pwm# file. This mode is only
124 available on the F71858FG / F8000 if the fan channel is in RPM mode.
125 126* 2: Normal auto mode
127 You can define a number of temperature/fan speed trip points, which % the
128 fan should run at at this temp and which temp a fan should follow using the
129 standard sysfs interface. The number and type of trip points is chip
130 depended, see which files are available in sysfs.
131 Fan/PWM channel 3 of the F8000 is always in this mode!
132 133* 3: Thermostat mode (Only available on the F8000 when in duty cycle mode)
134 The fan speed is regulated to keep the temp the fan is mapped to between
135 temp#_auto_point2_temp and temp#_auto_point3_temp.
136 137All of the automatic modes require that pwm1 corresponds to fan1, pwm2 to
138fan2 and pwm3 to fan3.
139